Single-pass welding with wide groove gap and double-sided forming method and apparatus

Abstract

The present application relates to the field of material processing technology, and discloses a single-sided welding double-sided forming method and equipment suitable for wide welding groove gap, comprising the following steps: S1, installing a temporary clamp code on the back of the welding groove of two base materials to be welded; S2, fixing a gasket to the back of the welding groove of the two base materials; S3, laying iron powder in the welding groove of the two base materials; S4, installing a first welding wire on a first welding gun and a second welding wire on a second welding gun, connecting the negative pole of a welding power supply to the first welding gun and the base materials in parallel, connecting the positive pole of the welding power supply to the second welding gun, and welding. Since the first welding wire is connected to the base materials in parallel, part of the welding circuit current will flow through the first welding wire from the base materials, that is, welding arc heat will be generated between the first welding wire and the second welding wire, so that the welding arc heat between the second welding wire and the base materials is reduced, and the base materials are prevented from being welded through due to excessive heat input under the condition of a wide welding groove gap.

Description

Technical Field

[0001] This application relates to the field of materials processing technology, and in particular to a method and equipment for single-sided welding with double-sided forming applicable to wide welding groove gaps. Background Technology

[0002] The single-sided welding with double-sided forming method involves first welding a backing onto the back of the weld bevel of the base material and then filling the weld bevel with special welding powder. Finally, welding is performed on one side, achieving the effect of single-sided welding with double-sided forming. Due to its high efficiency and excellent weld quality, this method is widely used in high-end equipment manufacturing fields such as shipbuilding, marine engineering, and aerospace.

[0003] Existing single-sided welding with double-sided forming methods mainly employ a single power supply system and require welding multiple weld seams. For example, Chinese patent application CN118559161A discloses a submerged arc welding method for single-sided welding with double-sided forming, which requires welding four layers, resulting in a long overall welding operation time. Furthermore, the root gap width of the weld bevel must be controlled between 0 and 3 mm. If the root gap width is greater than 3 mm, a large heat input must be applied to melt a large amount of welding wire to fill the bevel, which can easily burn through the base material under continuous high heat input. However, in practical engineering applications, especially during the assembly and joining of ship sections, it is often difficult to meet the root gap requirements when joining two base materials. Summary of the Invention

[0004] The purpose of this application is to provide a single-sided welding double-sided forming method applicable to wide welding groove gaps. Using this method, the overall welding operation time is short and the width requirement for the root gap of the welding grooves of the two base materials is low.

[0005] To achieve the above objectives, this application provides a single-sided welding double-sided forming method applicable to wide welding groove gaps, comprising the following steps: S1. Install and fix temporary clips on the back of the welding bevels of the two base materials to be welded. The width of the root gap of the welding bevels of the two base materials is D1, and the range of D1 is 3 to 11 mm. The thickness of the base material is D2, and the range of D2 is 8 to 13 mm. S2. With the gasket facing upward, pass it through the clearance hole of the temporary clip and fix the gasket to the back of the welding bevel of the two base materials, wherein the central axis of the gasket is aligned with the central axis of the welding bevel of the two base materials. S3. Lay iron powder in the welding groove of the two base materials; S4. The first welding wire is installed on the first welding gun, and the second welding wire is installed on the second welding gun. The negative terminal of the welding power supply is connected to the first welding gun and the base material. The first welding gun and the base material are connected in parallel. The positive terminal of the welding power supply is connected to the second welding gun. Adjust the length L1 of the first welding wire extending out of the first contact tip of the first welding gun, the length L2 of the second welding wire extending out of the second contact tip of the second welding gun, the wire feeding speed V1 of the first welding wire, and the wire feeding speed V2 of the second welding wire. Finally, the ends of the first welding wire and the second welding wire are brought together and intersected. The intersection point is buried in the iron powder for welding.

[0006] Furthermore, in step S4, the first welding torch is set vertically, the second welding torch is tilted forward, and the first welding torch is located behind the second welding torch; the first welding torch and the second welding torch move from back to front to perform welding.

[0007] Further, in step S4, the included angle between the first welding gun and the second welding gun is 30±5°; the depth at which the intersection of the first welding wire and the second welding wire is embedded in the iron powder is in the range of 0.5~1mm, wherein the thickness of the iron powder is H1, H1=D1+1mm, D1+1mm≤D2.

[0008] Furthermore, L1 and D1 are negatively correlated, V1 and D1 are positively correlated, and the wire feeding speed of the second welding wire is V2, which is negatively correlated with D1.

[0009] Furthermore, the output voltage of the welding power source is positively correlated with D1.

[0010] Furthermore, the range of L2 is 40–50 mm.

[0011] Furthermore, in step S1, the temporary clip is welded to the back of the weld bevel of the two base materials; In step S2, the gasket is bonded to the back of the welding bevel of the two base materials; After the gasket is bonded, a support block is inserted between the gasket and the temporary clip to further tighten and secure the gasket.

[0012] Furthermore, in step S1, the angle of the welding bevel is 30~40°, and the blunt edge of the welding bevel is 0~1mm.

[0013] A single-sided welding double-sided forming device applicable to wide welding groove gaps, based on any one of the single-sided welding double-sided forming methods described above, the device comprising: The first welding torch is used to mount the first welding wire; The first adjustment device includes a first height adjustment device for adjusting the height of the first welding torch and a first angle adjustment device for adjusting the angle of the first welding torch. The second welding torch is used to mount the second welding wire; The second adjustment device includes a second height adjustment device for adjusting the height of the second welding torch and a second angle adjustment device for adjusting the angle of the second welding torch. A welding power source, the negative terminal of which is connected to the first welding torch and the base material, the first welding torch and the base material are connected in parallel, and the positive terminal is connected to the second welding torch; The welding carriage can move at a constant speed continuously. The welding power source is installed on the welding carriage. The first welding torch is installed on the welding carriage through a first adjustment device, and the second welding torch is installed on the welding carriage through a second adjustment device. The first welding torch and the second welding torch are driven by the welding carriage to move at a constant speed for welding at a constant speed.

[0014] Compared with the prior art, the single-sided welding double-sided forming method with wide welding groove gaps in the embodiments of this application has the following advantages: The method of this application embodiment first lays iron powder in the welding groove of two base materials, and then performs welding. The negative terminal of the welding power source is connected to the first welding torch and the base material, which are connected in parallel. The positive terminal of the welding power source is connected to the second welding torch. A first welding wire is installed on the first welding torch, and a second welding wire is installed on the second welding torch, meaning the first welding wire is connected in parallel with the base material. When welding with a wide welding groove gap, because the first welding wire is connected in parallel with the base material, part of the welding circuit current will be diverted from the base material and flow through the first welding wire. This generates welding arc heat between the first and second welding wires, thus reducing the welding arc heat between the second welding wire and the base material, preventing burn-through due to excessive heat input in the base material under wide welding groove gaps. During welding, because welding arc heat is also generated between the first and second welding wires, one welding power source simultaneously heats and melts both welding wires. Combined with the iron powder in the welding groove, only a single pass is required to complete the welding, resulting in fast welding speed and short overall welding operation time. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the equipment welding the base material in the embodiment of this application.

[0016] Figure 2 This is a schematic diagram of the temporary card code installed on the back of the welding bevel of the base material according to an embodiment of this application.

[0017] Figure 3 This is a schematic diagram of the back of the weld bevel of the base material, as described in the embodiments of this application.

[0018] Figure 4 This is a schematic diagram of iron powder being laid in the welding groove according to an embodiment of this application.

[0019] Figure 5 This is a schematic diagram of the welding state in an embodiment of this application.

[0020] Figure 6 This is a physical image of the weld seam welded by the method in the embodiments of this application.

[0021] In the diagram, 1. Base material; 11. Welding bevel; 12. Iron powder; 2. Temporary clamp; 21. Relief part; 3. Gasket; 4. Support block; 5. First welding torch; 51. First contact tip; 52. First welding wire; 53. First adjustment device; 531. First height adjustment device; 5311. First moving rod; 532. First angle adjustment device; 5321. First hinge point; 6. Second welding torch; 61. Second contact tip; 62. Second welding wire 63. Second adjustment device; 631. Second height adjustment device; 6311. Second moving rod; 632. Second angle adjustment device; 6321. Second hinge point; 7. Welding power source; 8. Flux; 91. Weld slag; 92. Weld; D1. Width of the root gap of the welding groove; D2. Thickness of the base material; L1. Length of the first welding wire extending beyond the first conductive tip; L2. Length of the second welding wire extending beyond the second conductive tip; H1. Thickness of iron powder. Detailed Implementation

[0022] The specific embodiments of this application will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this application, but are not intended to limit the scope of this application.

[0023] The directions such as front, back, left, and right mentioned in this article are defined relative to the directions in the various accompanying figures. They are relative concepts and therefore can change depending on their different positions and practical applications. Therefore, these or other directions should not be interpreted as restrictive terms.

[0024] Furthermore, the terms "first," "second," etc., are primarily used to distinguish different devices, elements, or components (which may be the same or different in specific type and construction), and are not intended to indicate or imply the relative importance or quantity of the indicated devices, elements, or components. Unless otherwise stated, "a plurality of" means two or more.

[0025] like Figure 1As shown in the figure, an embodiment of this application discloses a single-sided welding double-sided forming device suitable for wide welding groove gaps, including a first welding torch 5, a first adjusting device 53, a second welding torch 6, a second adjusting device 63, a welding power source 7, and a welding carriage (not shown in the figure). The negative terminal of the welding power source 7 is connected to the first welding torch 5 and the base material 1, which are connected in parallel; the positive terminal is connected to the second welding torch 6. The welding power source 7, the first adjusting device 53, and the second adjusting device 63 are all mounted on the welding carriage. The first welding torch 5 is mounted on the first adjusting device 53 to be mounted on the welding carriage, and the second welding torch 6 is mounted on the second adjusting device 63 to be mounted on the welding carriage. The welding carriage continuously moves at a constant speed, driving the first welding torch 5 and the second welding torch 6 to move at a constant speed for uniform welding.

[0026] The first adjustment device 53 includes a first height adjustment device 531 and a first angle adjustment device 532. The first height adjustment device 531 includes a first moving rod 5311. The first angle adjustment device 532 is installed at the lower end of the first moving rod 5311. The first welding torch 5 is hinged to the first angle adjustment device 532. The first moving rod 5311 moves up and down, driving the first angle adjustment device 532 and the first welding torch 5 hinged thereto to move up and down to adjust the height of the first welding torch 5. The first welding torch 5 rotates around the first hinge point 5321 to adjust the angle. The second adjustment device 63 includes a second height adjustment device 631 and a second angle adjustment device 632. The second height adjustment device 631 includes a second moving rod 6311. The second angle adjustment device 632 is installed at the lower end of the second moving rod 6311. The second welding torch 6 is hinged to the second angle adjustment device 632. The up-and-down movement of the second moving rod 6311 drives the second angle adjustment device 632 and the second welding torch 6 hinged thereto to move up and down, adjusting the height of the second welding torch 6. The second welding torch 6 rotates around the second hinge point 6321 to adjust the angle. The welding carriage moves at a constant speed, driving the first welding torch 5 and the second welding torch 6 to move at a constant speed for welding.

[0027] like Figures 1 to 6 As shown, this application discloses a single-sided welding double-sided forming method applicable to wide welding groove gaps, comprising the following steps: S1. Install and fix temporary clips 2 on the back of the welding grooves 11 of the two base materials 1 to be welded. The width of the root gap of the welding grooves 11 of the two base materials 1 is D1, and the range of D1 is 3 to 11 mm. The range of this width D1 is the wide welding groove gap. The thickness of the base material is D2, and the range of D2 is 8 to 13 mm. S2. The operating pad 3 is passed through the clearance hole 21 of the temporary clip 2 with the pad facing upward, and the pad 3 is fixed to the back of the welding groove 11 of the two base materials 1, wherein the central axis of the pad 3 is consistent with the central axis of the welding groove 11 of the two base materials 1. S3. Lay iron powder 12 inside the welding groove 11 of the two base materials 1; S4. The first welding wire 52 is installed on the first welding gun 5, and the second welding wire 62 is installed on the second welding gun 6. The negative terminal of the welding power source 7 is connected to the first welding gun 5 and the base material 1. The first welding gun 5 and the base material 1 are connected in parallel. The positive terminal of the welding power source 7 is connected to the second welding gun 6. The length L1 of the first welding wire 52 extending out of the first conductive tip 51 of the first welding gun 5, the length L2 of the second welding wire 62 extending out of the second conductive tip 61 of the second welding gun 6, the wire feeding speed V1 of the first welding wire, and the wire feeding speed V2 of the second welding wire are adjusted. Finally, the intersection of the first welding wire 52 and the second welding wire 62 is buried in the iron powder 12 for welding.

[0028] Since the first welding wire 52 is connected in parallel with the base material 1, the current flows through the first welding wire 52 and the base material 1 respectively. That is, welding arc heat is generated between the first welding wire 52 and the second welding wire 62, and between the base material 1 and the second welding wire 62. The welding arc diameter is relatively large and the welding arc stiffness is relatively weak, resulting in less impact on the backing 3. Because welding arc heat is generated between the first welding wire and the second welding wire, the welding arc heat between the second welding wire and the base material is reduced, avoiding burn-through due to excessive heat input in wide welding groove gaps. Therefore, it can be applied to wide welding groove gaps of 3 to 11 mm.

[0029] Preferably, before step S1, welding grooves 11 are opened on the two base materials 1, wherein the angle of the welding groove 11 is 30~40°, the blunt edge of the welding groove is 0~1mm, preferably 0mm, to ensure that the welding arc can completely melt the blunt edge and the reverse weld formation effect is good.

[0030] Preferably, in step S1, there are two temporary clips 2. The two temporary clips 2 are specifically welded to the front and rear parts of the back side of the welding bevel of the two base materials, respectively, and the distance between the two temporary clips 2 is 300-400mm.

[0031] Preferably, in step S2, the gasket 3 is a ceramic gasket (FGB gasket). The specific installation steps are as follows: Before installation, remove the protective glossy paper tape from the adhesive surface of the gasket 3. Pass the gasket 3 with the adhesive side facing upward through the clearance hole 21 of the temporary clip 2. Then, apply pressure evenly to the gasket 3 from bottom to top along its length to ensure that the gasket 3 is in full contact with and bonded to the back of the base material 1. Securely bond the adhesive side of the gasket 3 to the back of the base material 1 to complete the installation of the gasket 3. After the gasket 3 is bonded, insert a support block 4 between the gasket 3 and the temporary clip 2 to further tighten and fix the gasket 3.

[0032] Preferably, in step S3, flux 8 is laid on top of iron powder 12.

[0033] Preferably, in step S4, the first welding torch 5 and the second welding torch 6 are on the same plane in the front-to-back direction. The first welding torch 5 is vertically positioned, and the second welding torch 6 is tilted forward, with the first welding torch 5 located behind the second welding torch 6. The included angle between the first welding torch 5 and the second welding torch 6 is 30±5°. The intersection of the first welding wire 52 and the second welding wire 62 is located at the transverse center of the welding groove 11 to prevent heat from being biased to one side. The welding carriage moves at a constant speed from back to front, driving the first welding torch 5 and the second welding torch 6 to move at a constant speed for welding. When the iron powder is embedded at the intersection point where the ends of the first welding wire 52 and the second welding wire 62 abut against each other for welding, the second welding wire 52 tilts forward. On the one hand, this can push away the iron powder 12 in front, reducing the resistance to movement; on the other hand, it can support the liquid metal formed by welding behind, improving the stability of the molten pool. The thickness of the iron powder is H1, where H1 = D1 + 1mm, and D1 + 1mm ≤ D2. The depth at which the iron powder 12 is embedded at the intersection of the first welding wire 52 and the second welding wire 62 ranges from 0.5 to 1mm. This avoids difficulties in arc ignition due to excessive embedding and ensures that the iron powder 12 effectively encapsulates the welding arc during welding, reducing spatter caused by arc blow. The thickness H1 of the iron powder does not exceed the thickness D2 of the base material 1 and is only 1mm greater than the width D1 of the root gap of the welding groove. The thickness H1 compensates for the edge loss of the iron powder 12 under the blowing force of the welding arc and effectively prevents the iron powder from being too thick, which could cause it to overflow from the welding groove 11 during welding, contaminating the surface of the base material 1 or causing the weld reinforcement to exceed the standard.

[0034] Preferably, the length L2 of the second welding wire 62 extending out of the second conductive tip of the second welding gun 6 is in the range of 40 to 50 mm. Within this range, the second welding wire 62 has high melting efficiency and, due to the length left between the end of the second welding wire 62 and the second conductive tip 61, forms a sufficient flexible transition space. The conductive tip will not be blocked or burned by high-temperature spatter due to being too close to the molten pool, resulting in a stable welding process and good weld formation quality.

[0035] Preferably, the length L1 of the first welding wire 52 extending beyond the first conductive tip 51 of the first welding torch 5 is negatively correlated with the width D1 of the root gap of the welding groove 11; the wire feeding speed V1 of the first welding wire is positively correlated with the width D1 of the root gap of the welding groove 11; and the wire feeding speed V2 of the second welding wire is negatively correlated with the width D1 of the root gap of the welding groove 11. The output voltage of the welding power source 7 is positively correlated with the width D1 of the root gap of the welding groove 11.

[0036] The relationship between the parameters is explained with the base material thickness D2 being 13mm. The welding parameters for the width D1 of the root gap of different welding grooves 11 are shown in Table 1. The angle of the welding groove is 30°, and the diameters of the first welding wire 52 and the second welding wire 62 are both 4mm.

[0037] Table 1: As shown in Table 1, when the width D1 of the root gap of the welding groove 11 is small, the thickness H1 of the iron powder is small, the risk of burn-through is low, the welding carriage moves at a slightly faster speed, and the welding speed is fast. Therefore, the heat required to melt the base material 1 and the iron powder 12 per unit time is large. At this time, it is necessary to adjust the length L1 of the first welding wire 52 extending out of the first conductive tip 51 of the first welding gun 5. When L1 increases, the resistance of the first welding wire 52 increases, and the welding current through the first welding wire 52 decreases, thereby reducing the welding arc heat generated between the first welding wire 52 and the second welding wire 62, thereby increasing the welding arc heat between the second welding wire 62 and the base material 1, and ensuring root penetration of the welding groove 11.

[0038] Conversely, when the width D1 of the root gap of the welding groove 11 is large, the thickness H1 of the iron powder is large, the risk of burn-through is high, the welding carriage moves at a slightly slower speed, and the welding speed is slow. Therefore, the heat required to melt the base material 1 and the iron powder 12 per unit time is small. At this time, it is necessary to adjust the length L1 of the first welding wire 52 extending out of the first conductive tip 51 of the first welding gun 5. When L1 is reduced, the resistance of the first welding wire 52 decreases, and the welding current through the first welding wire 52 increases, thereby increasing the welding arc heat generated between the first welding wire 52 and the second welding wire 62, thereby reducing the welding arc heat between the second welding wire 62 and the base material 1, and preventing the base material 1 from being burned through.

[0039] The welding process of the single-sided welding double-sided forming method applicable to the wide welding groove gap in this application is as follows: First, adjust the first conductive tip 51 of the first welding torch 5 and the second conductive tip 61 of the second welding torch 6 to adjust the length L1 of the first welding wire 52 extending from the first conductive tip 51 of the first welding torch 5 and the length L2 of the second welding wire 62 extending from the second conductive tip 61 of the second welding torch 6. Then, adjust the first adjusting device 53 and the second adjusting device 63 to adjust the position and angle of the first welding wire 52 and the second welding wire 62. Then, turn on the device, and the welding carriage moves at a constant speed, driving the first welding wire 52 and the second welding wire 62 to move at a constant speed for welding.

[0040] The welding arc melts the iron powder 12, the first welding wire 52, the second welding wire 62, and the welding bevel 11, and the molten metal together forms a weld pool. The welding arc also melts part of the backing 3 and part of the flux 8 below it. The backing 3 supports the weld pool, giving it a suitable shape and preventing it from sagging or burning through. Simultaneously, the welding arc melts the flux 8 above it, forming liquid flux 8, which covers the welding arc and the weld pool, providing stable protection. As the welding carriage continues to move at a constant speed, the first welding wire 52 and the second welding wire 62 move synchronously and at a constant speed, the welding arc moves forward synchronously and at a constant speed, the liquid metal pool gradually cools to form weld metal, and the liquid flux 8 gradually cools to form slag 91. After welding a length of 800-1000 mm, remove the surface slag 91 from weld 92 and the backing 3 from the back of weld 92. Check the surface formation quality of the weld on both sides and fine-tune the welding parameters according to the surface formation quality of weld 92. The specific adjustment process is as follows: If the back-side forming size of weld 92 is too small and the front-side forming size is too large, then adjust downward the depth of the intersection of the first welding wire 52 and the second welding wire 62 embedded in the iron powder 12; if the back-side forming size of weld 92 is too large and the front-side forming size is too small, then adjust upward the depth of the intersection of the first welding wire 52 and the second welding wire 62 embedded in the iron powder 12.

[0041] If the forming dimensions on both sides of weld 92 are too large, increase the welding carriage speed (welding speed) or decrease the output voltage of the welding power source (welding voltage); if the forming dimensions on the back side and the forming dimensions on the front side of weld 92 are too small, decrease the welding carriage speed (welding speed) or increase the output voltage of the welding power source (welding voltage).

[0042] If the weld reinforcement on the front side is too large, the weld width is insufficient, and the weld formation size on the back side is small, then reduce the wire feeding speed V1 of the first welding wire and the length L1 of the first welding wire extending out of the first contact tip of the first welding gun; if the weld reinforcement on the front side is insufficient, the weld width is too large, and the weld formation size on the back side is large, then increase the wire feeding speed V1 of the first welding wire and the length L1 of the first welding wire extending out of the first contact tip of the first welding gun.

[0043] In summary, this application provides a single-sided welding double-sided forming method applicable to wide welding groove gaps. First, iron powder 12 is laid within the welding groove 11 of two base materials 1, and then welding is performed. The negative terminal of the welding power source 7 is connected to the first welding torch 5 and the base material 1, and the first welding torch 5 and the base material 1 are connected in parallel. The positive terminal of the welding power source 7 is connected to the second welding torch 6. A first welding wire 52 is installed on the first welding torch 5, and a second welding wire 62 is installed on the second welding torch 6, meaning the first welding wire 52 is connected in parallel with the base material 1. Since the first welding wire 52 is connected in parallel with the base material 1, part of the welding circuit current will be diverted from the base material 1 and flow through the first welding wire 52. That is, welding arc heat will be generated between the first welding wire 52 and the second welding wire 62. This reduces the welding arc heat between the second welding wire 62 and the base material 1, and avoids the base material 1 from being welded through due to excessive heat input under the wide welding groove 11 gap. During welding, since welding arc heat will also be generated between the first welding wire 52 and the second welding wire 62, one welding power source 7 heats and melts the two welding wires at the same time. With the help of the iron powder 12 in the welding groove 11, only a single pass of welding is required to complete the welding. The welding speed is fast and the overall welding operation time is short.

[0044] The above description is only a preferred embodiment of this application. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of this application, and these improvements and substitutions should also be considered within the scope of protection of this application.

Claims

1. A single-sided welding double-sided forming method applicable to wide welding groove gaps, characterized in that: Includes the following steps: S1. Install and fix temporary clips on the back of the welding bevels of the two base materials to be welded. The width of the root gap of the welding bevels of the two base materials is D1, and the range of D1 is 3 to 11 mm. The thickness of the base material is D2, and the range of D2 is 8 to 13 mm. S2. With the gasket facing upward and passing through the clearance hole of the temporary clip, fix the gasket to the back of the welding bevel of the two base materials, wherein the central axis of the gasket is aligned with the central axis of the welding bevel of the two base materials. S3. Lay iron powder in the welding groove of the two base materials; S4. The first welding wire is installed on the first welding gun, and the second welding wire is installed on the second welding gun. The negative terminal of the welding power supply is connected to the first welding gun and the base material. The first welding gun and the base material are connected in parallel. The positive terminal of the welding power supply is connected to the second welding gun. Adjust the length L1 of the first welding wire extending out of the first contact tip of the first welding gun, the length L2 of the second welding wire extending out of the second contact tip of the second welding gun, the wire feeding speed V1 of the first welding wire, and the wire feeding speed V2 of the second welding wire. Finally, the ends of the first welding wire and the second welding wire are brought together and intersected. The intersection point is buried in the iron powder for welding.

2. The single-sided welding double-sided forming method as described in claim 1, characterized in that: In step S4, the first welding torch is set vertically, the second welding torch is tilted forward, and the first welding torch is located behind the second welding torch; the first welding torch and the second welding torch move from back to front to perform welding.

3. The single-sided welding double-sided forming method as described in claim 2, characterized in that: In step S4, the included angle between the first welding gun and the second welding gun is 30±5°; the depth at which the intersection of the first welding wire and the second welding wire is embedded in the iron powder is in the range of 0.5~1mm, wherein the thickness of the iron powder is H1, H1=D1+1mm, D1+1mm≤D2.

4. The single-sided welding double-sided forming method as described in claim 3, characterized in that: The L1 and D1 are negatively correlated, the V1 and D1 are positively correlated, and the wire feeding speed of the second welding wire is V2, which is negatively correlated with D1.

5. The single-sided welding double-sided forming method as described in claim 4, characterized in that: The output voltage of the welding power source is positively correlated with D1.

6. The single-sided welding double-sided forming method as described in claim 4, characterized in that: The range of L2 is 40–50 mm.

7. The single-sided welding double-sided forming method according to any one of claims 1-6, characterized in that: In step S1, the temporary clips are welded to the back of the weld bevels of the two base materials; In step S2, the gasket is bonded to the back of the weld bevel of the two base materials; After the gasket is bonded, a support block is inserted between the gasket and the temporary clip to further tighten and secure the gasket.

8. The single-sided welding double-sided forming method according to any one of claims 1-6, characterized in that: In step S1, the angle of the welding bevel is 30~40°, and the blunt edge of the welding bevel is 0~1mm.

9. A single-sided welding double-sided forming device suitable for wide welding groove gaps, characterized in that: It is based on the single-sided welding double-sided forming method as described in any one of claims 1-8, and the equipment includes: The first welding torch is used to mount the first welding wire; The first adjustment device includes a first height adjustment device for adjusting the height of the first welding torch and a first angle adjustment device for adjusting the angle of the first welding torch. The second welding torch is used to mount the second welding wire; The second adjustment device includes a second height adjustment device for adjusting the height of the second welding torch and a second angle adjustment device for adjusting the angle of the second welding torch. A welding power source, the negative terminal of which is connected to the first welding torch and the base material, the first welding torch and the base material are connected in parallel, and the positive terminal is connected to the second welding torch; The welding carriage can move at a constant speed continuously. The welding power source is installed on the welding carriage. The first welding torch is installed on the welding carriage through a first adjustment device, and the second welding torch is installed on the welding carriage through a second adjustment device. The first welding torch and the second welding torch are driven by the welding carriage to move at a constant speed for welding at a constant speed.

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